68 Lake Maxinkuckee, Physical and Biological Survey 



weight 3, ! oz. ; length 104 mm., alt. 54 mm., diameter 33 mm. 

 Parasites, Ata.r 6, free among gills, eggs of Atax on inner side of 

 mantle, young in pits on side of foot. Food, Microcystis aerug- 

 inosa most common. Lyngbya aestuarii, Navicula, Melosira, 

 Anuraea and Cymbella. 



Intestinal contents of two examples of L. luteola obtained in 

 Lake Maxinkuckee Aug. 27, 1908, near the shore just north of the 

 ice-office gave the following results : 



Sample 29. Microcystis aeruginosa, main mass; Anuraea coch- 

 lea ris a few; Botryococcus braunii rather common; Cymbella 

 cymbiformis, one; Lyngbya aesturaii, 1 filament; Navicula, 2 ex- 

 amples; Synedra, a few. 



Sample 30. Microcystis aeruginosa main mass; Botryococcus 

 braunii, very common; Lyngbya aesturarii, several filaments; 

 Anuraea cochlearis a few; Synedra some; Navicula one example, 

 very lively ; Cosmarium one round worm like vinegar eel, very 

 lively. 



Sample 31. Lost Lake, 1908. A good mass of material, black- 

 ish below, flocculent greenish above. 



Lyngbya aesturarii, a few filaments; Microcystis aeruginosa, 

 quite abundant; Anuraea cochlearis; sponge spicule, Pediastrum 

 duplex, Staurastrum , Botryococcus braunii, Peridinium tabuhdum, 

 a few; Peridinium, a small spiny species 1; Pediastrum boryanum; 

 several diatoms — Navicula, Coscinodiscus, Melosira, Cymbella 

 cymbiformis; Microcystis is the most abundant element, Peridinium 

 is rather scarce. 



Sample 32. Lake Maxinkuckee, Aug. 27, 1908. A small 

 amount of brownish green flocculent material. 



Anuraea cochlearis, quite frequent ; Lyngbya aestuarii, short 

 filament; Peridinium tabulatum, a few; Coelastrum microporum; 

 Coelosphaerium kuetzingianum ; Pediastrum boryanum; Scenedes- 

 mus, very few; Chydorus fragment. Diatoms, — Epithemia turgida, 

 Navicula, Cymbella cymbiformis, Gomphonema, Coscinodiscus. 



Sample 33. Lake Maxinkuckee, Aug. 27, 1908. A fair amount 

 of brownish green material, muddy below, flocculent green above. 

 The green top material consisting chiefly of Microcystis aerug- 

 inosa; with some Anuraea cochlearis; Lyngbya aestuarii; Micro- 

 cystis aeriiginosa; Bulbochaete bristle; Coelastrum microporum; 

 Merismopedia glaaca; Pediastrum boryanum; diatoms — Navicula, 

 Coscinodiscus, etc. 



Measurements: — The following is a series of measurements of 

 Lost Lake examples: 



